【摘要】 为了扩大无线电能传输(Wireless Power Transfer, WPT)系统的输出电压范围，提出一种基于双发射线圈的无线充电电路。通过发射线圈三种工作模式的切换，实现了输出电压的宽范围调节。首先，分析不同模式下输出电压和输入阻抗的特性，给出三种模式的划分依据和对应的电压增益范围。然后，分析线圈、补偿元件和负载对各模式电压增益范围的影响，给出电压增益范围的调整方法，以确保输出电压在模式切换时的连续性。接着，给出了确保高频逆变器零电压开通(Zero-Voltage-Switching, ZVS)的参数调整方法。最后，通过仿真和实验验证了该方案的有效性和正确性，所设计的样机功率为1 kW。实验结果表明，相较于单发射线圈方案，该方案的输出电压范围更宽，且在输出电压宽范围调节时效率明显提高，最大提高约2.7%。更多还原

【Abstract】 In order to extend the output voltage range of wireless power transfer(WPT) system, a WPT circuit based on dual transmitting coils is proposed. By switching the three working modes of the transmitting coils, the output voltage can be adjusted in a wide range. Firstly, the characteristics of the output voltage and input impedance of different modes are analyzed. The criterion for the classification of the three modes and the corresponding voltage gain range are given. Then the influence of the coils, compensation elements and load on the range of voltage gain under each mode is analyzed. The method to adjust the voltage range is given to ensure the continuity of the output voltage during mode switching. Secondly, the method to realize zero-voltage-switching(ZVS) of the high-frequency inverter is given. Finally, the validity and correctness of the proposed scheme are verified by simulation and experiment, in which a 1 kW prototype was built based on the proposed scheme. The experimental results show that compared with the circuit with single transmitting coil, the proposed scheme has a wider output voltage range, and the efficiency of the proposed WPT circuit is significantly improved when the output voltage is adjusted in a wide range, with the maximum efficiency increment of about 2.7%.更多还原